Вывести все разные слова предложения

def Intro(b): 
    f = [] 
    j = [] 
    for i in b: 
        if (i not in j) and (i not in f): 
            j.append(i) 
        f.append(i) 
    return j 
try: 
    a = "To be or not to be?"
    a = a.lower() 
    b = a.split() 
    print(Intro(b)) 
except ValueError: 
    print("Input Error!")

Word = []
[Word.append(i) for i in input().lower().split() if i not in Word]
print(Word)

a = input()
s = []
res = ''
for i in a:
    if i.isalpha():
        res += i
    else:
        s.append(res)
        res = ''
print(*s)

import string
#==============================================================================
def get_uniq_words(s):
    res   = set()
    words = s.split()
    for w in words:
        res.add( w.strip( string.punctuation ).lower() )
    return ' '.join( list( res ) )
#==============================================================================
s = input( 'Предложение: ' )
print( get_uniq_words(s) )

import re
print(re.findall(r'(\w+)(?!.*\1)', "To be or not to be?".lower()))

s = "To be or not to beee?"
print(set(re.findall(r'\w+', s.lower())))

s = "To be or not to beee? be or not or not to"
print(re.findall(r'(?i)(\b\w+\b)(?!.*?\b\1\b)', s))